Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products.. If you can't find the Sterling Heavy Truck Repair Manuals, Sterling Wiring Diagrams, Diagonstic Code Readers, Sterling Diesel Scan Tools, or Diesel Engine Diagnostics Software products you need please call us at (989) 839-4877..